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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   −1x+1y+4z=15,−2x+0y−1z=−12,0x+0y+2z=8\;-1x + 1y + 4z = 15, \quad -2x + 0y - 1z = -12, \quad 0x + 0y + 2z = 8. What is xx?